At the risk of being flippant... A room that can be light sealed. You can get little baggies to unload your film and put in developing tanks which are sealed (the baggies that is, they have entries for your hands but the bag itself is light sealed even after your hands go in there with your film canister), so the room doesnt have to be... but for printing... I've often wanted to go down the path you are on, Mark, and I am stuck at the room.

Oh, you need running water too, IIRC, although I don't think thats mandatory.

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